Welcome to the Atlassian developer community @Calvin,
I’m a bit biased with 10 years of experience inside Atlassian, and even some development experience on Atlassian prior. I think it’s a good niche skill, with plenty of customer demand. For starting today, there’s no doubt in my mind that you should start with Forge. And (again biased), I think the hottest area is Forge apps to build Rovo Agents. It’s fun, easy, and AI is so hot right now. If you need something already in use at your company, my 2nd pick would be Confluence Macros.
Hope you find reasons to be here more often!